ClickHouse

Leading open-source columnar database for real-time analytics, particularly strong in AdTech data processing

ClickHouse is a high-performance, open-source columnar database management system (DBMS) originally developed by Yandex for web analytics. It excels at online analytical processing (OLAP) queries on massive datasets, delivering sub-second query response times on billions of rows. The company was spun out from Yandex in 2021 and offers both an open-source version and a managed cloud service called ClickHouse Cloud. In the AdTech ecosystem, ClickHouse has become a critical infrastructure component for companies processing large volumes of advertising data, including impressions, clicks, conversions, and bid stream data. Its columnar storage format and vectorized query execution make it particularly well-suited for real-time reporting, audience analytics, attribution modeling, and campaign performance analysis. Major AdTech companies and publishers use ClickHouse to power their analytics pipelines and data warehousing needs. ClickHouse Inc. provides enterprise support, managed cloud services, and additional features beyond the open-source offering. The company has raised significant venture capital funding and serves customers across various industries including AdTech, gaming, observability, and financial services, with notable users including Cloudflare, Uber, eBay, and numerous advertising technology platforms.